Topic
Heat pipe
About: Heat pipe is a research topic. Over the lifetime, 30354 publications have been published within this topic receiving 243669 citations. The topic is also known as: heatpipe & heat-pipe.
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TL;DR: The microscopic details of fluid flow and heat transfer near the contact line of an evaporating extended meniscus of heptane formed between a horizontal substrate and a "washer" were studied at low heat fluxes as discussed by the authors.
Abstract: The microscopic details of fluid flow and heat transfer near the contact line of an evaporating extended meniscus of heptane formed between a horizontal substrate and a “washer” were studied at low heat fluxes. The film profile in the contact line region was measured using ellipsometry and microcomputer-enhanced video microscopy, which demonstrated the details of the transition between a nonevaporating superheated flat thin film and an evaporating curved film. Using the augmented Young-Laplace equation, the interfacial properties of the system were initially evaluated in situ and then used to describe the transport processes. New analytical procedures demonstrated the importance of two dimensionless parameters. Both fluid flow and evaporation depend on the intermolecular force field, which is a function of the film profile. The thickness and curvature profiles agreed with the predictions based on interfacial transport phenomena models. The heat flux distribution and the pressure field were obtained. Since there are significant resistances to heat transfer in this small system due to interfacial forces, viscous stresses, and thermal conduction, the “ideal constant heat flux” cannot be attained. The description of the pressure field gives the details of the coupling between the disjoining and capillary pressures.
155 citations
TL;DR: In this article, the integration of a near atmospheric pressure solid oxide fuel cell (SOFC) with a novel all-othermal biomass steam gasification process into a combined heat and power (CHP) system of less than MWe nominal output range is investigated.
154 citations
TL;DR: In this paper, the hydrodynamics of enhanced longitudinal heat transfer through a sinusoidally oscillating viscous fluid in an array of parallel-plate channels with conducting sidewalls are examined analytically.
Abstract: The hydrodynamics of enhanced longitudinal heat transfer through a sinusoidally oscillating viscous fluid in an array of parallel-plate channels with conducting sidewalls is examined analytically. Results show that for fixed frequency the corresponding effective thermal diffusivity reaches a maximum when the product of the Prandtl number and the square of the Womersley number is approximately equal to α2 Pr = π Under such tuned conditions the axial heat transfer achievable is considerable and can exceed that possible with heat pipes by several orders of magnitude. The heat flux between different temperature reservoirs connecting the parallel-plate-channel configuration is shown, under tuned conditions, to be proportional to the first power of both the axial temperature gradient and the flow oscillation frequency and to the square of the tidal displacements. A large value for the fluid density and specific heat is also found to be beneficial when large heat-transfer rates are desired. The process discussed involves no net convection and hence achieves large heat-transfer rates (in excess of 106 W/cm2) without a corresponding net convective mass transfer. A discussion of the physical origin for this new heat-transfer process is given and suggestions for applications are presented.
152 citations
Patent•
30 Oct 1998
TL;DR: In this article, a quick charge battery with thermal management is described, which includes a cooler preferably disposed at least partially within the battery to transfer thermal energy, and is capable of cooling the battery and selectively heating the battery.
Abstract: A quick charge battery with thermal management is described which includes a cooler preferably disposed at least partially within the battery to transfer thermal energy. The cooler may comprise a thermoelectric generator, a microcooler, a heat pipe or combinations of the above. The cooler is capable of cooling the battery and in some embodiments selectively heating the battery to a minimum temperature level. The cooler functions to cool the battery and thereby minimizes thermal build-up produced by rapid charging of the battery.
152 citations
TL;DR: In this article, a heat pipe based thermal management system for high power battery, with eight prismatic cells, has been proposed, designed and tested for heat load up to 400 W. The heat pipe system consists of two parts: heat pipe cooling plates to extract heat from individual prismatic cell of the battery module, and remote heat transfer heat pipes to transport heat from the module to liquid cooled cold plates located 300 mm away.
151 citations